This is a science. Yes, officially it do not recognize now - for many reasons.
But accuracy, reproducibility of results same as in other, official sciences - in psychology, biology.
To check up it is possible on own experience (as well as any other scientific work).

If I want speak about "something to try" - please visit:
http://nabljudatel.narod.ru/sun.html
The man, who know meditation - will feel at once, who does not know - that need study about one month.

Everything, that we have written it was known earlier (for example, school by Yogananda), but is described in such precise system and in detail - for the first time.